Conciseness

The body is lean and imperative throughout — an inputs checklist, routing commands, QC gates, and outputs — with no explanation of concepts Claude already knows and no padding. Every line carries non-obvious domain specifics (flags, output paths, gates), matching the 'every token earns its place' anchor rather than the score-4 'minor trim' anchor.

Actionability

Three fully-flagged, copy-paste-ready commands (preflight, shared epigenomics package, dedicated ATAC runner) plus concrete artifact names ('qc/atacseq_qc_summary.{tsv,json}', 'qc/atacseq_qc_dashboard.html', 'tracks/', 'resources/resource_plan.json') cover the common cases. This meets the 'fully executable; copy-paste ready; covers common cases' anchor, exceeding score 4 which permits minor gaps.

Workflow Clarity

There is a clear sequence (confirm essential inputs → route/preflight → run the appropriate runner → review QC gates → emit outputs) with an explicit checkpoint ('Review before biological interpretation'; 'Do not proceed to differential accessibility if replicate quality or metadata is insufficient'). It stops short of score 5 because there is no fix-and-retry feedback loop for failing samples and the failed-sample handling is only referenced as an output flag.

Progressive Disclosure

Sections are well-organized with no nested references and clearly signaled external script paths, but the body inlines a substantial amount of runner-flag and resource-plan documentation that would fit a one-level-deep reference file, and details like the sample-sheet format are never linked. This matches the 'good structure; most content appropriately placed; minor organization gaps' anchor rather than the fully split score-5 structure.

Specificity

The description enumerates concrete pipeline actions — 'ATAC-seq QC, alignment, TSS enrichment, fragment-size, blacklist, peak-calling, consensus peak, and differential accessibility' — giving comprehensive domain coverage. It exceeds the score-4 anchor ('several specific actions; minor gaps') because there is no meaningful capability gap.

Completeness

The 'what' is clearly and comprehensively stated, but there is no 'Use when...' clause or equivalent explicit trigger guidance — the rubric explicitly caps completeness at 3 in that case. It is not a 4 because the 'when' is entirely missing rather than merely imprecise.

Trigger Term Quality

Good coverage of natural terms an ATAC-seq user would say ('ATAC-seq', 'peak-calling', 'TSS enrichment', 'differential accessibility'), but common synonyms like 'chromatin accessibility', 'open chromatin', 'FRiP', and file extensions (.fastq/.bam) are absent. This matches the 'good keyword coverage; a few natural terms missing' anchor rather than the comprehensive score-5 anchor.

Distinctiveness Conflict Risk

'ATAC-seq' plus assay-specific deliverables (TSS enrichment, consensus peaks, differential accessibility) carve a clear niche with minimal conflict risk, but closely related NGS-epigenomics skills (the body references 'ngs-chip-cutrun-peaks-qc') could overlap on generic terms like 'QC' and 'peak-calling'. This is the 'mostly distinct; minor overlap risk' anchor, not the fully distinct score-5 anchor.